Headquarters: SIKO GmbH Weihermattenweg 2 79256 Buchenbach Germany Phone+49 7661 394-0

Wire-actuated encoder SG121

robust design with 12 m measurement length

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Universally applicable wire-actuated encoder with measuring lengths of max. 12000 mm, robust construction as well as precise and safe wire guidance, prepared for attaching the most diverse types of rotary encoders with a 58 mm standard flange.

Profile SG121:

  • Robust design
  • Easy mounting
  • Measurement lengths up to max. 12000 mm
  • Flexible wire outlet thanks to Wire-Flex technology
  • Incremental or absolute encoder
  • Also available as a safety version in combination with WV58MR rotary encoder
  • High flexibility thanks to free choice of rotary encoders with 58 mm standard flange
  • Various wire types
  • With PURE.MOBILE technology
PURE.MOBILE Functional Safety PLd SSI SAE J1939 CANopen CANopen Safety

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Mechanical data
FeatureTechnical dataAdditional information
Wire designø0.6 mm steel cable
ø0.6 mm steel cable, plastic sheathed
ø0.6 mm para-line
Extension force≥8 N on the rope
Measured distance/ rope drum revolution200 mm
Acceleration≤23.5 m/s2
Electrical data
Rotary encoders suitable for the SG121 are featured on our website www.siko-global.com. Depending on the output signals, the following are suitable for:
  • Analog outputs such as current or voltage: AV58M
  • Incremental outputs: IV5800
  • Absolute outputs: WV58MR, WV5800M, WV36M/SSI, WV36M/CAN
Among others, SIKO encoders have the following interfaces: Incremental, SSI, CANopen, CANopen Safety, SAE J1939, Field bus, and Ethernet

The technical specifications for these devices are given in the respective data sheet. Numerous encoder models from various manufacturers can also be used.
System data
FeatureTechnical dataAdditional information
Repeat accuracy ±0.15 mm mechanical, depending on the direction of travel (1st position)
Measuring range≤12000 mm
Travel speed≤3000 mm/s
Ambient conditions
FeatureTechnical dataAdditional information
Ambient temperature-20 … +80 °C
Protection category depending on the mounted rotary encoder
Shock resistance500 m/s2, 11 ms EN 60068-2-27
Vibration resistance100 m/s2, 5 … 150 Hz EN 60068-2-6
Wire-actuated encoder SG121
Hint for mounting

When securing the wire it must be ensured that the wire is straight and vertical in relation to the wire outlet.  Recommendation: Only select the starting position after an unwound length of approx. 5 mm. This prevents the wire hitting the end stop when it is rewound.

SG121 Hint for mounting
symbolic depiction

Extension length/measuring range
SIKO wire-actuated encoders achieve the maximum measuring accuracy when the entire wire length (measuring range) is only wound onto the drum in one layer.  On the SG121, the wire diameter is selected so that when the first drum layer is used, a maximum measuring range of 6000 mm is possible.

If a lower measuring accuracy is acceptable, two to three layer winding is also possible, and the possible measuring lengths change accordingly.

SG121 Extension length/measuring range
dimensions refer to millimeters

Scope of delivery
  • SG121
  • Quick Start Guide
Ordering table
Feature Order data Specifications Additional information
Measuring range
7000, 8000, 9000, 10000, 11000, 12000 in mm
Rope fixture
wire suspension with thread
wire suspension with hook
wire suspension with ring
Wire design
stainless steel wire
steel wire, plastic-sheathed
Encoder type
without encoder
great number of encoders possible
Position of electrical connection
direction or wire outlet or axiallydepending on installed encoder
opposite the wire outlet
without encoder
Ordering key

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Melanie Augustin

Melanie Augustin
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